Key points are not available for this paper at this time.
A search was made at the Brookhaven alternating gradient synchrotron for magnetic monopoles produced either in collisions of 30-BeV protons with light nuclei, or produced by rays secondary to these protons in the Coulomb field of protons or of carbon nuclei. In runs using 5. 710^15 circulating protons, no monopolelike event was found. This implies an upper limit for production in proton-nucleon interactions of about 210^-40 cm^2. Experimental limits are also derived for the photoproduction of pole pairs.
Purcell et al. (Fri,) studied this question.